accessory mineral

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accessory mineral

[ak′ses·ə·rē ‚min·rəl]
(mineralogy)
A minor mineral in an igneous rock that does not affect its general character.
References in periodicals archive ?
An additional source of Fe was the primary iron oxides (ilmenite, magnetite, Figure 1), which were present as accessory minerals and thus also at low concentrations.
Fluorapatite, zircon, Nb-Ta-Ti oxides, xenotime-(Y) and monazite-(Ce) are rare accessory minerals.
In order to identify the accessory minerals in the region of Ghareh Gheshlegh, field research and laboratory studies were carried out.
Accessory minerals include amphibole, aegirine, sphene, rutile, zircon and apatite (Jan et al.
Accessory minerals (fine-grained microlitic zircon, apatite, monazite, and allanite) were identified and confirmed using a scanning electron microscope including backscattered electron imaging, energy-dispersive X-ray spectroscopy and X-ray element mapping.
4b), indicates the absence of fine-grained phosphatic and titaniferous accessory minerals hosting these elements.
He-diffusion studies have also been conducted for other common minerals such as titanite, monazite, hematite, and zircon, all of which are common accessory minerals in igneous and metamorphic rocks.
This specific deposit contains 70 per cent calcite, a form of calcium carbonate; 10 per cent apatite, a rock phosphate (source of calcium and phosphorous); 15 per cent biotite/vermiculite; and 5 per cent of accessory minerals such as pyroxene, chlorite, magnetite, and feldspar.
The three papers in the first section focus on petrological observations combined with trace element and isotopic data of accessory minerals to link their formation with major mineral phases, and ultimately to the pressure-temperature-time path of metamorphic rocks.

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